Тема: The Infinite Monkey Cage - BBC

Although studying theoretical mathematics concepts is an important component of GMAT prep, it is perhaps more important to work numerous practice problems. Consequently, we hope you enjoyed these 50 free practice GMAT problem solving questions with thorough answers. We strongly believe that our proprietary custom-written problems offer a remarkably realistic means of practicing mathematics concepts likely to be tested. Please feel free to download and distribute the accompanying PDF ( another PDF too ), which contains problem solving questions.

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Although studying theoretical mathematics concepts is an important component of GMAT prep, it is perhaps more important to work numerous practice problems. Consequently, we hope you enjoyed these 50 free practice GMAT problem solving questions with thorough answers. We strongly believe that our proprietary custom-written problems offer a remarkably realistic means of practicing mathematics concepts likely to be tested. Please feel free to download and distribute the accompanying PDF ( another PDF too ), which contains problem solving questions.

Start with: 0.240 = (0.300 - x)^2/0.200 + x Subtract 0.240 from both sides 0 = (0.300 - x)^2/0.200 + x - 0.240 Multiply out the squared term 0 = (0.300 - x)(0.300 - x)/0.200 + x - 0.240 0 = (0.09 - 0.6x + x^2)/0.200 + x - 0.240 Divide each numerator term by 0.2 0 = 0.45 - 3.0x + 5x^2 + x - 0.240 Combine and reorder: 0 = 5x^2 -2x + 0.21 This disagrees with the answer you were given because *that* answer is wrong. To prove my point, go to http://gcalc.net and plot the following expression. [This is just the original equation except that I moved the constant 0.240 term to the right side.] (0.300 - x)^2/0.200 + x -0.24 Now plot the expression: 5x^2 -2x + 0.21 You'll see that these two equations overlay each other exactly -- they are equal. Now try plotting the equation that you were given: x^2 + 0.440x + (-0.110) It's not even close. As a simpler test, plug in x=0 (0.300 - x)^2/0.200 + x -0.240 (0.300)^2/0.200 -0.240 0.09/0.200 -0.240 0.45 -0.240 0.21 Doing the same thing with the answer derived here: 5x^2 -2x + 0.21 0.21 Note this is identical. Finally, plugging in x=0 into the answer you were given: x^2 + 0.440x + (-0.110) (-0.110) oops. No cigar. Thus: a = 5 b = -2 c = 0.21 You might notice that another answerer *nearly" got this correct. They solved it slightly differently, so the coefficients are divided by 5 (which is fine). However, they screwed up one step when they tried to multiply through by 0.2, but one term they accidentally multiply by 0.24. Other than that arithmetic error, their solution was fine.

Have been tweeting great quotes from , but quadratic equation shit"s taking all my brain cycles this session. Back in an hour

Although studying theoretical mathematics concepts is an important component of GMAT prep, it is perhaps more important to work numerous practice problems. Consequently, we hope you enjoyed these 50 free practice GMAT problem solving questions with thorough answers. We strongly believe that our proprietary custom-written problems offer a remarkably realistic means of practicing mathematics concepts likely to be tested. Please feel free to download and distribute the accompanying PDF ( another PDF too ), which contains problem solving questions.

This calculator solves quadratic equations. You can solve equations by completing the square or by using quadratic formula. The calculator will write down complete solution. Every step will be explained in detail.

Enter quadratic equation of the form ( ax 2 + bx + c = 0 )
You can enter either integers ( 10 ), decimal numbers( 10.12 ) or FRACTIONS (10/3).
Important: The form will NOT let you enter illegal characters like a, u, %, y, p,. How to input??

Enter expression, e.g. (x^2-y^2)/(x-y) Sample Problem Simplify

Enter expression, e.g. x^2+5x+6 Sample Problem Factor

And,  solution of single variable quadratic equation,  value of π correct to 4 decimal places

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Solve quadratic equations using the quadratic formula. For example, solve -9x+10x²+8=14.

y=8/x from the 2nd equation. Substitute this into the first: x^2 +4(64)/x^2 - 68 = 0 Multiply by x^2, then use quadratic equation to solve for x^2. x^4 - 68 x^2 + 256 = 0 Actually, this is easier to factor than to apply Q.E.: (x^2 - 64)(x^2 -4) = 0 The four possible solutions for x should now jump out at you. Now plug those values back into y=8/x to get the y values. Answers are (8, 1), (-8, -1), (2, 4) (-2, -4) Put those back into x^2+4y^2=68 to check: 64+4=68 for the first pair. Check. 4+64 = 68 for the last pair. Check. If you solve x^2+4y^2=68 for y, you get two equations for half circles. y=8/x is a hyperbola. Here s a graph of the equations: http://i276.photobucket.com/albums/kk2/freond1/quadequations.png

When am i ever going to use the quadratic equation in my job? School should teach useful courses like doing taxes and how to shave ur pubes.

recall formula: r*t = d where: r = speed t = time d = distance let: j = speed of turbo jet p = speed of super-pro plane j(t - 3) = 2000 p*t = 2800 p = 2800/t j = p + 50 j = 2800/t + 50 j(t - 3) = 2000 (2800/t + 5)(t - 3) = 2000 2800 + 50t - (8400/t) - 150 = 2000 multiply all terms by t: 2800t + 50t^2 - 8400 - 150t = 2000t 50t^2 + 650t - 8400 = 0 50(t^2 + 13t - 168) = 0 50(x - 8)(x + 21) = 0 x = 8 x = -21 (ignore negative time) j(t - 3) = 2000 j(8 - 3) = 2000 5j = 2000 j = 400 j = p + 50 400 = p + 50 p = 350

It"s been almost five years and I"ll never forget Mrs. Lackey smacking a stapler repeatedly and yelling THIS IS A QUADRATIC EQUATION!!!

Although studying theoretical mathematics concepts is an important component of GMAT prep, it is perhaps more important to work numerous practice problems. Consequently, we hope you enjoyed these 50 free practice GMAT problem solving questions with thorough answers. We strongly believe that our proprietary custom-written problems offer a remarkably realistic means of practicing mathematics concepts likely to be tested. Please feel free to download and distribute the accompanying PDF ( another PDF too ), which contains problem solving questions.

This calculator solves quadratic equations. You can solve equations by completing the square or by using quadratic formula. The calculator will write down complete solution. Every step will be explained in detail.

Enter quadratic equation of the form ( ax 2 + bx + c = 0 )
You can enter either integers ( 10 ), decimal numbers( 10.12 ) or FRACTIONS (10/3).
Important: The form will NOT let you enter illegal characters like a, u, %, y, p,. How to input??

Enter expression, e.g. (x^2-y^2)/(x-y) Sample Problem Simplify

Enter expression, e.g. x^2+5x+6 Sample Problem Factor

The solution is where the equations 'meet' or intersect. The red point on the right is the solution of a system of linear equations.

A system of a linear equation and a quadratic equation can have one real solution , two real solutions or no real solutions.

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I was never good at math. Is that a quadratic equation?

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Although studying theoretical mathematics concepts is an important component of GMAT prep, it is perhaps more important to work numerous practice problems. Consequently, we hope you enjoyed these 50 free practice GMAT problem solving questions with thorough answers. We strongly believe that our proprietary custom-written problems offer a remarkably realistic means of practicing mathematics concepts likely to be tested. Please feel free to download and distribute the accompanying PDF ( another PDF too ), which contains problem solving questions.

This calculator solves quadratic equations. You can solve equations by completing the square or by using quadratic formula. The calculator will write down complete solution. Every step will be explained in detail.

Enter quadratic equation of the form ( ax 2 + bx + c = 0 )
You can enter either integers ( 10 ), decimal numbers( 10.12 ) or FRACTIONS (10/3).
Important: The form will NOT let you enter illegal characters like a, u, %, y, p,. How to input??